What Do You Find Works Better For A Legit SEO Business? Sales Letter vs. E-commerce-ish

So, I'm in the process of starting up a legit SEO/Marketing business. I have the domain, and I even made a decent website, that looks very similar to http://www.linkwheel.net/

After browsing around on BHW for a while, I decided to check out some of the ads and see what they have to offer, and I found that most of the SEO providers are in sales letter form. (http://seopaladin.com/)

What design do you guys find is more effective? A basically one page website with a buy now link at the bottom, and a convincing sales letter, or a multi page website with lots of facts/information, and certain pages for the buy now links. I know the traffic matters a lot, but lets just use media buys, and SEO traffic as an example.

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